Thiamethoxam application to control White flay Bemisia tabaci on cucumber plants under greenhouse conditions showed acceptable efficacy. Moreover, the application of thiamethoxam with ultra-low volume (ULV) spray technique caused a significant average reduction to White flay population reached 90.17 and 91.03 % in both working seasons respectively when compared with low volume (LV) which caused average reduction reached to 87.37 and 86.50 %, respectively. Additionally, the ultra-low volume spray technique significantly reduced thiamethoxam residues in soil and cucumber leaves and fruits when compared with the low volume spray technique. Lengths and weights of cucumber fruits treated with (ULV) technique increased significantly than those treated with (LV) technique. Both spray techniques caused a significant increase in cucumber fruit yield per plant.